is conjugate base of retinoid anion retinoate 3,7-dimethyl-9-(2,6,6-trimethylcyclohex-1-en-1-yl)nona-2,4,6,8-tetraenoate InChI=1S/C20H28O2/c1-15(8-6-9-16(2)14-19(21)22)11-12-18-17(3)10-7-13-20(18,4)5/h6,8-9,11-12,14H,7,10,13H2,1-5H3,(H,21,22)/p-1 CHEBI:15036 chebi_ontology C20H27O2 299.42718 retinoate -1 SHGAZHPCJJPHSC-UHFFFAOYSA-M CC(C=CC1=C(C)CCCC1(C)C)=CC=CC(C)=CC([O-])=O 299.20165 retinoic acid monocarboxylic acid anion